diff --git a/CMakeLists.txt b/CMakeLists.txt
index a5edd61..e821d8d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,7 +18,7 @@ set (PROGRAM_EXE ${CMAKE_PROJECT_NAME})
 
 set (PROGRAM_SOURCE
 	src/string.cpp
-	src/ec.cpp
+	src/ec/openssl.cpp
 	src/base58.cpp
 	src/checksum.cpp
 	src/WIF.cpp
diff --git a/src/WIF.cpp b/src/WIF.cpp
index 618de62..5577d8e 100644
--- a/src/WIF.cpp
+++ b/src/WIF.cpp
@@ -27,16 +27,19 @@
 #include "checksum.h"
 #include "WIF.h"
 
+#define PRIV_KEY_PREFIX 0x80 /* 0x80 for "Bitcoin mainnet". Always used by EOS. */
+
 std::string wif_priv_encode(ec_privkey_t priv) {
 
 	checksum_t check;
-	unsigned char buf[37] = { 0x80 };
+	// 1 byte extra for prefix.
+	unsigned char buf[1 + EC_PRIVKEY_SIZE + CHECKSUM_SIZE] = { PRIV_KEY_PREFIX };
 
 	memcpy(buf + 1, priv.data(), priv.size());
 
 	// Checksum
-	check = checksum_sha256d(buf, 33);
-	memcpy(buf + 33, check.data(), check.size());
+	check = checksum_sha256d(buf, 1 + EC_PRIVKEY_SIZE);
+	memcpy(buf + 1 + EC_PRIVKEY_SIZE, check.data(), check.size());
 
 	return base58_encode(buf, buf + sizeof(buf));
 }
@@ -44,10 +47,10 @@ std::string wif_priv_encode(ec_privkey_t priv) {
 std::string wif_pub_encode(ec_pubkey_t pub) {
 
 	checksum_t check = checksum_ripemd160(pub.data(), pub.size());
-	unsigned char buf[37];
+	unsigned char buf[EC_PUBKEY_SIZE + CHECKSUM_SIZE];
 
 	memcpy(buf, pub.data(), pub.size());
-	memcpy(buf + 33, check.data(), check.size());
+	memcpy(buf + EC_PUBKEY_SIZE, check.data(), check.size());
 
 	return "EOS" + base58_encode(buf, buf + sizeof(buf));
 }
diff --git a/src/WIF.h b/src/WIF.h
index 06b4a63..48eb6a8 100644
--- a/src/WIF.h
+++ b/src/WIF.h
@@ -25,7 +25,7 @@
 #define WIF_H
 
 #include <string>
-#include "ec.h"
+#include "ec/types.h"
 
 std::string wif_priv_encode(ec_privkey_t priv);
 
diff --git a/src/benchmark.cpp b/src/benchmark.cpp
index 6fb6c66..228b045 100644
--- a/src/benchmark.cpp
+++ b/src/benchmark.cpp
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 #include <chrono>
-#include "ec.h"
+#include "ec/generate.h"
 #include "benchmark.h"
 
 using std::chrono::steady_clock;
diff --git a/src/checksum.h b/src/checksum.h
index 57f50e8..1ac08a2 100644
--- a/src/checksum.h
+++ b/src/checksum.h
@@ -27,7 +27,9 @@
 #include <cstddef>
 #include <array>
 
-typedef std::array<unsigned char, 4> checksum_t;
+#define CHECKSUM_SIZE 4
+
+typedef std::array<unsigned char, CHECKSUM_SIZE> checksum_t;
 
 checksum_t checksum_sha256d(const unsigned char *data, std::size_t len);
 
diff --git a/src/types.h b/src/ec/generate.h
similarity index 82%
rename from src/types.h
rename to src/ec/generate.h
index eba5182..ccde10c 100644
--- a/src/types.h
+++ b/src/ec/generate.h
@@ -21,10 +21,15 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#ifndef TYPES_H
-#define TYPES_H
+#ifndef EC_GENERATE_H
+#define EC_GENERATE_H
 
-#define EC_PRIVKEY_SIZE 32
-#define EC_PUBKEY_SIZE 33 /* Compressed: 32 bytes + 1 prefix */
+#include "types.h"
 
-#endif /* TYPES_H */
+/**
+ * Generates a keypair using the secp256k1 curve.
+ * public key is in compressed format.
+ */
+int ec_generate_key(struct ec_keypair *pair);
+
+#endif /* EC_GENERATE_H */
diff --git a/src/ec.cpp b/src/ec/openssl.cpp
similarity index 98%
rename from src/ec.cpp
rename to src/ec/openssl.cpp
index d277eda..40e0cf3 100644
--- a/src/ec.cpp
+++ b/src/ec/openssl.cpp
@@ -24,7 +24,7 @@
 #include <openssl/ec.h>
 #include <openssl/bn.h>
 #include <openssl/hmac.h>
-#include "ec.h"
+#include "generate.h"
 
 static int ec_generate_pair(unsigned char *priv, unsigned char *pub) {
 
diff --git a/src/ec.h b/src/ec/types.h
similarity index 83%
rename from src/ec.h
rename to src/ec/types.h
index b29a8a4..19a2312 100644
--- a/src/ec.h
+++ b/src/ec/types.h
@@ -21,11 +21,19 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#ifndef EC_H
-#define EC_H
+#ifndef EC_TYPES_H
+#define EC_TYPES_H
 
 #include <array>
-#include "types.h"
+
+#define EC_PRIVKEY_SIZE 32
+
+/*
+ * Compressed format!
+ * z||x, where byte z specifies which (of the 2) solutions of the quadratic equation y is.
+ * Each cordinate is 32 bytes.
+ */
+#define EC_PUBKEY_SIZE (32 + 1)
 
 typedef std::array<unsigned char, EC_PRIVKEY_SIZE> ec_privkey_t;
 typedef std::array<unsigned char, EC_PUBKEY_SIZE> ec_pubkey_t;
@@ -35,6 +43,4 @@ struct ec_keypair {
 	ec_pubkey_t pub;
 };
 
-int ec_generate_key(struct ec_keypair *pair);
-
-#endif /* EC_H */
+#endif /* EC_TYPES_H */
diff --git a/src/key_search.cpp b/src/key_search.cpp
index 285962b..9e1a259 100644
--- a/src/key_search.cpp
+++ b/src/key_search.cpp
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 #include <string>
-#include "ec.h"
+#include "ec/generate.h"
 #include "key_search_helpers.h"
 #include "key_search.h"
 
diff --git a/src/key_search_helpers.h b/src/key_search_helpers.h
index 66e7783..1b80105 100644
--- a/src/key_search_helpers.h
+++ b/src/key_search_helpers.h
@@ -25,7 +25,7 @@
 #define KEY_SEARCH_HELPERS_H
 
 #include "string.h"
-#include "ec.h"
+#include "ec/types.h"
 
 struct key_result {
 	size_t pos; // position where the word was found.
diff --git a/src/key_search_mt.cpp b/src/key_search_mt.cpp
index 3d7dc5e..85f3e2a 100644
--- a/src/key_search_mt.cpp
+++ b/src/key_search_mt.cpp
@@ -25,7 +25,7 @@
 #include <thread>
 #include <mutex>
 #include <vector>
-#include "ec.h"
+#include "ec/generate.h"
 #include "key_search_helpers.h"
 #include "key_search.h"
 
diff --git a/src/main.cpp b/src/main.cpp
index d83e9de..002c05d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -28,7 +28,7 @@
 #include <cstring>
 #include "string.h"
 #include "WIF.h"
-#include "ec.h"
+#include "ec/generate.h"
 #include "key_search.h"
 #include "benchmark.h"